Le 06/10/2017 à 18:12, J. Fahrner a écrit :
Hello,
I found the message
"systemd-udevd[415]: renamed network interface eth0 to eth1"
in my dmesg log.
1. why is there a systemd daemon?
2. why is my ethernet device renamed?
I would like it as eth0 and wlan0, not eth1 and wlan1.
Jochen
If your machine is running Devuan, you shouldn't have Systemd
running. Maybe "Systemd-udev" is just the new name for "Udev". Since the
advent of Udev, the interfaces are renamed automatically, by Udev, when
they are discovered by the kernel. The goal is to have a stable
interface name attached to any given interface, given that there is no
guaranty on the order in which the kernel discovers the interfaces. Udev
remembers the MAC addresses of the interfaces and gives them stable
numbers. For that, it asks the kernel to rename them. When a yet unknown
interface is discovered it is given the lowest unused number.
The rationale behind this is debatable and has been vastly
discussed on this list, but the fact is that it is working like this.
If you aren't satisfied witht the current numbering of your
interfaces, there is a simple way to change the numbering:
find the file /etc/udev/rules.d/70-persistent-net-rules. You will
see there is a line per known interface, containing notably its MAC
address (eg ATTR{address}=="e8:de:27:a8:14:e1") and the name it will be
given (eg NAME="eth0"). You can change the names and/or the MAC
addresses, but take care that a name or a MAC address doesn't appear twice.
You can notice that each rule contains variable names separated
from the value by == , which is a condition and, at the end, NAME=ethX,
which is an assignment. Each "rule" is preceded by a comment line
indicating the PCI address of the device.
You can also let Udev forget all the MAC addresses it knows and
restart numbering the existing interfaces from scratch. For this, just
erase all the lines; only keep the 5 comment lines at the beginning.
HTH.
Didier
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